Relief-valve



(No Model.) 2 Sheets-Sheet 1.

A. N. CARVER 8u N. J. STONE.

RELIEF VALVE. No. 396,858. Patented Jan. 29, 1889.

mi.. e, sa 5 Wmsaaa. I Mmm m (No Model.) 2 sheets-sheen 2.

A. N. CARVER & N. J. STONE.

RELIEF VALVE.

N0. 396,858. Patented Jan. 29, 1889.

UNITED STATES PATENT FFTCE@ ALBERT N. CARVER AND NORMAN J. STONE, OF BOSTON, MASSACHUSETTS.

RELIEF=VALVE.

SPECIFICATION forming part of Letters Patent No. 396,858, dated January 29, 1889.

Application filed June 16, 1888. Serial No. 277,323. (No 1nodel.)'

To all whom it may concern.-

Be it known that we, ALBERT N. CARVER and NORMAN J. STONE, both ot' Boston, in the county of Suitolk and State ot' h'lassachusetts,

have invented a certain new and uset'ul Improvement in Relief-Valves, ot' which the following is a specification.

Our invention relates to relietvalves for lire-engines and pumps; and it consists in cerro tain new and useful constructions and combinations of the parts of the same, substantially hereinafter described and claimed.

In the drawings, Fi gure l. is a central vertical section ot a relief-valve and its casing construct-ed according to ourinvention. Fig. 2 is a section on the line .fr of Fig. l. Fig. 3 represents the lower portion ot' Fig. l, with a modification of the relief-Vabre. Fig. i is a side View of the .relief-valve shown in Fig. 2o A is the casing of the reliefwalve.

B is the in duct-pipe leading from the pumpcylinder of the fire-engine, or the cylinder ot' any other pump to which the valve is to be applied, by a spout on the delivery side thereof.

2 5 C is the educt-passage ot the valve leading to the suction of the engine or pump.

In the lower part of the casing A a chamber, E, is formed around the valve V. This valve consists of a section of a cylinder or tube 3o of metal, which is attached to the pisti'in-rod o3 by arms r2. The valve works up and down in the tubular casing e, located centrally in the chamber E, and its rod r3 passes through the upper wall, ci, of the chamber, being kept 3 5 water-tight therein by the stuffing-box nl. This rod passes into a chamber, c, above the first one, and is attached to an enlargement of itself, it. Alongside of the chamber c is another cylindrical chamber, e?, within the 4o casing, opening downward into the chamber E on the induct side ot' the valve V. ln this cylindrical chamber c'e the piston (L works up and down snugly. To the piston (Lis pivoted the link a2 at its lower end, which is also pivoted at its upper end to the lever CL3. This lever is pivoted at at to the wall of the casing which divides the chambers c and c2. The opposite end of this lever CL3 passesinto a slot made transversely through the rod c, and is 5o pivoted in that slot to the link a5, which in turn pivoted to the rod c by the pivot d, passing transversely through the same.

The parts described are so arranged and proportioned that when the valve V is drawn upward, so as to close the annular space above the wall e, connecting the chamber E with the educt-pi pe C, the piston a will be at the lowest point ot its movement in the cylinder c2.

The rod if@ passes through the cover A of 6o the chambers c and c'e into and through the supplemental chamber formed by the vertical wall N and the cover In this chamber another slot is made transversely through the rod, and the spring is attached by screws at one end to the cover A and has its free end, which is slotted transversely, as shown in dotted lines, entering this slot in the rodar. The upper end ot the rod if is made tubular and has a thread cut in its interior, with which 7o a corresponding thread on the exterior ot the tubular rod s engages, so that the tubular rod s may be raised and llowered in the rod o6 by means of the hand-wheel S, attached to its upperend. A cyliinlrieal rod, s2, passes downward through the tubular rod` s, being held in place therein by a collar, s4, and nut, S3, at its upper end, so as to allow ot' the tubular rod s revolving freely about its exterior. The lower end ot' this rod s? passes downward 8o through a hole in the rod fr into the upper transverse slot which is formed therein, and this rod has a corresponding transverse slot cut through it, through which the tree end of the spring s extends. A pivot, s, passes 8 5 transversely through the rod s2 and the slotted free end ot` the spring, so as to carry the end of the spring up and down with the rod s2. By this construction the rod 32 is secured in its position up and down in the tubular rod 9o s, and the latter 'is secured by its serew-thread in the rod rb', thus cansin the adjustment ot' the tubular rod s in the rod r6, to bring a greater or less strain of the spring upward upon the rod rt, and hold the reliei`-valvc at` 95 tached to the latter in its closed position.

their the stream is shut oft' from the hose of the I'h'ecugine, or the pump of the latter is run faster, so as to unduly increase the pressure of the water and endanger the burstroo ing of the hose, the increased pressure of the water upon the piston a. :forces the latter upward in its cylinder, turning the lever CL3 on its pivot and forcing the valve-stem r3 o downward again/st the tension of the spring S5, carrying the valve V with it and opening the passage between the chanrber E and the eduet-pipe C, thus relievin g the pressure upon the delivery side of the pump.

A waste-cock, M, is attached to the lower part of the chamber c, so that in case the water leaks past the piston u, and overflows into this chamber it may be drawn ott.

In Figs. 3 and li a modification ot' the valve V is shown and oi' the wall e, which is here divided into two parts, e and c2, the latterprojecting downward from the bottom '1f'y ot' the chamber c, andthe valve V is made in the form of a cylinder, with vertical struts o con.- necting it to a ring, .02, to which the spider t2 and rod t3 are attached. When the valve V is moved downward by the piston a, as bel'ore, the water flows through the openings 'n n between the vertical struts o and escapes through the educt-passage C, as before. rlhe advantage of this arrangement is that the valve is balanced and the pressure ol' the water upon the struts o o, in Ilowi ng past them,'

the eduet-passage C, connected to its suction, the piston a, pivoted lever a3, and valve V, arranged to allow the water by its pressure to open the valve and permit the water to vflow from passage B outward through passage C, substantially as described.

2. In combination with the induct-pipe B, connected to the delivery of the pump, and the educt-passage C, connected to its suction, the piston a, pivoted lever a3, valve V, arranged to allow the water by its pressure to open the valve and permit the water to flow from passage .B outward through passage C, and thel spring s", arranged to close the valve V when the pressure is diminished upon the piston a, substantially as described.

3. The combination of the valve V, its valve stem Lf-31:, the tubular rod s, adjustable within the rod fr by its screw-thread, the rod s2, passing through the same and carried therewith, and the spring' s, pivoted to the latter rod, substantially as described.

4. The combination ot' the induct-passage B, the educt-passage C, the chamber E, the tubular walls e e?, and the valve V, fitted to and arranged to move up and down within said walls and connected to its rod o3 by the vertical struts o around its upper edge, substantially as described.

AL BERT N. CARVER. NORMAN J. STONE.

Witnesses:

N. P. OCKINGToN, DAvID HALL RICE. 

